stream: more iter streams fixes

[jasnell]

Another round of streams/iter fixes.

Builds on: #66028 ... The first four commits are from that PR. This will remain a draft until that one lands

[nodejs-github-bot]

Review requested:

• @nodejs/streams

[codecov]

Codecov Report

❌ Patch coverage is 89.27790% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.26%. Comparing base (fa95cd5) to head (d0ff99c).
⚠️ Report is 40 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/streams/iter/from.js	86.25%	32 Missing and 4 partials ⚠️
lib/internal/streams/iter/pull.js	88.23%	6 Missing ⚠️
lib/internal/streams/iter/share.js	90.32%	2 Missing and 1 partial ⚠️
lib/internal/streams/iter/utils.js	93.61%	3 Missing ⚠️
lib/internal/streams/iter/broadcast.js	97.14%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66030      +/-   ##
==========================================
- Coverage   90.27%   90.26%   -0.01%     
==========================================
  Files         789      789              
  Lines      271623   271894     +271     
  Branches    51847    51911      +64     
==========================================
+ Hits       245196   245416     +220     
- Misses      16910    16951      +41     
- Partials     9517     9527      +10     

Files with missing lines	Coverage Δ
lib/internal/streams/iter/consumers.js	97.09% <100.00%> (+0.14%)	⬆️
lib/internal/streams/iter/duplex.js	97.47% <100.00%> (+0.25%)	⬆️
lib/internal/streams/iter/broadcast.js	90.50% <97.14%> (+0.33%)	⬆️
lib/internal/streams/iter/share.js	89.32% <90.32%> (-0.20%)	⬇️
lib/internal/streams/iter/utils.js	97.04% <93.61%> (-1.36%)	⬇️
lib/internal/streams/iter/pull.js	83.82% <88.23%> (+0.06%)	⬆️
lib/internal/streams/iter/from.js	87.99% <86.25%> (-0.85%)	⬇️

... and 34 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[panva]

Review Asssisted-by: Codex

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/77614/ 💛